The New IASPEI Standard Broadband Magnitude mB
The New IASPEI Standard Broadband Magnitude mB
复制标题
DOI：
10.1785/gssrl.79.5.698
复制
发表时间：
2008-09
影响因子：
3.3
通讯作者：
P. Bormann;J. Saul
中科院分区：
文献类型：
--
作者：
P. Bormann;J. Saul
Ten years after the development of a local magnitude scale, M L, by Richter (1935), Gutenberg (1945a, 1945b, 1945c) proposed to extend the magnitude concept to measurements of maximum amplitudes of body and surface waves at teleseismic distances. For the first time this made possible comparable estimates of earthquake size on a global scale (Gutenberg and Richter 1949, 1954). In addition, body waves allow magnitude measurements for earthquakes at all depths. Teleseismic magnitudes were originally determined for earthquakes with magnitudes mostly around 6 and larger on intermediate- to long-period displacement-proportional records of seismographs with upper corner periods around 10 s to 20 s (Kanamori 1988). Accordingly, the body-wave calibration functions of Gutenberg and Richter (1956) were derived mainly from intermediate to long-period body-wave amplitudes measured at dominating wave-periods between about 3 s and 20 s ( e.g. , Abe 1981). Moreover, unlike M L and Gutenberg's original surface-wave magnitude M S, where maximum displacement amplitudes are measured in limited period ranges around 1 s and 20 s, respectively, Gutenberg and Richter realized that body-wave magnitudes m B measured at different stations are comparable only if the displacement amplitudes are normalized by their dominant periods. For m B this led Gutenberg and Richter to \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \[\ m\_{\mathrm{B}}=\mathrm{log}\_{10}(A{/}T)_{\mathrm{max}}+\mathrm{Q}({\Delta},h),\] \end{document}(1) where A is the displacement in μm, T the signal period in s, and Q is a function of distance Δ and focal depth h . Gutenberg's m B concept has been pursued ever since its inception in the former Soviet Union (and since then in Russia), China, and several eastern European countries. In most other countries, however, it was abandoned in favor of a short-period version m b in conjunction with the deployment of the WorldWide Standard Seismograph Network (WWSSN) in the 1960s. m b is based on maximum P -wave …
Ten years after the development of a local magnitude scale, M L, by Richter (1935), Gutenberg (1945a, 1945b, 1945c) proposed to extend the magnitude concept to measurements of maximum amplitudes of body and surface waves at teleseismic distances. For the first time this made possible comparable estimates of earthquake size on a global scale (Gutenberg and Richter 1949, 1954). In addition, body waves allow magnitude measurements for earthquakes at all depths. Teleseismic magnitudes were originally determined for earthquakes with magnitudes mostly around 6 and larger on intermediate- to long-period displacement-proportional records of seismographs with upper corner periods around 10 s to 20 s (Kanamori 1988). Accordingly, the body-wave calibration functions of Gutenberg and Richter (1956) were derived mainly from intermediate to long-period body-wave amplitudes measured at dominating wave-periods between about 3 s and 20 s ( e.g. , Abe 1981). Moreover, unlike M L and Gutenberg's original surface-wave magnitude M S, where maximum displacement amplitudes are measured in limited period ranges around 1 s and 20 s, respectively, Gutenberg and Richter realized that body-wave magnitudes m B measured at different stations are comparable only if the displacement amplitudes are normalized by their dominant periods. For m B this led Gutenberg and Richter to \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \[\ m\_{\mathrm{B}}=\mathrm{log}\_{10}(A{/}T)_{\mathrm{max}}+\mathrm{Q}({\Delta},h),\] \end{document}(1) where A is the displacement in μm, T the signal period in s, and Q is a function of distance Δ and focal depth h . Gutenberg's m B concept has been pursued ever since its inception in the former Soviet Union (and since then in Russia), China, and several eastern European countries. In most other countries, however, it was abandoned in favor of a short-period version m b in conjunction with the deployment of the WorldWide Standard Seismograph Network (WWSSN) in the 1960s. m b is based on maximum P -wave …